In the book, shiddah means that the letter's sound stops or is held at its articulation point. Its mnemonic is أَجِدْ قَطْ بَكَتْ, yielding the eight letters ء ج د ق ط ب ك ت.
Compare أَتْ and أَقْ slowly: the closure belongs to the consonant. Shiddah does not mean unnaturally lengthening or forcing it. Some shiddah letters also possess qualities such as qalqalah, which must be considered separately.
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Shiddah: sound stopping at the point
Ṣifāt al-Ḥurūf — Opposing Qualities and Strength Grades
In the book, shiddah means that the letter's sound stops or is held at its articulation point. Its mnemonic is أَجِدْ قَطْ بَكَتْ, yielding the eight letters ء ج د ق ط ب ك ت.
Compare أَتْ and أَقْ slowly: the closure belongs to the consonant. Shiddah does not mean unnaturally lengthening or forcing it. Some shiddah letters also possess qualities such as qalqalah, which must be considered separately.